What´s the best replacement for AQ271C (or 570) 5.7 GM engine, ideally stroker?

[bollerwagon]

Finally, I´m proceeding, the block will be machined. I plan to exchange and upgrade some parts. I have a list what I want to purchase for that. It would be great if you could comment and throw some wisdom/experience at me.

Questions would be:
- whats missing?
- whats not necessary to change because old part can be reused
- is the chosen part a wise choice?

Pos	item	Part #	Link
1	Fel-Pro Rear Main Seals	Fel-Pro BS40656	Fel-Pro BS40656 Fel-Pro Rear Main Seals | Summit Racing Free Shipping - Fel-Pro Rear Main Seals with qualifying orders of $99. Shop Rear Main Seals at Summit Racing. www.summitracing.com
2	Hauptlager Clevite P-Series Main Bearings	MS-909P	Clevite Engine Parts MS-909P Clevite P-Series Main Bearings | Summit Racing Free Shipping - Clevite P-Series Main Bearings with qualifying orders of $99. Shop Main Bearings at Summit Racing. www.summitracing.com
3	Clevite P-Series Rod Bearings	CB-663P(8)	Clevite Engine Parts CB-663P(8) Clevite P-Series Rod Bearings | Summit Racing Free Shipping - Clevite P-Series Rod Bearings with qualifying orders of $99. Shop Rod Bearings at Summit Racing. www.summitracing.com
4	Sealed Power Cam Bearings	SLP-1235M	Sealed Power 1235M Sealed Power Cam Bearings | Summit Racing Free Shipping - Sealed Power Cam Bearings with qualifying orders of $99. Shop Cam Bearings at Summit Racing. www.summitracing.com
5	freeze plugs	SUM-G1581	Summit Racing SUM-G1581 Free Shipping - Summit Racing SUM-G1581 with qualifying orders of $99. Shop Engine Expansion Plugs at Summit Racing. www.summitracing.com
6	Speed-Pro Hypereutectic Excess Pistons 020	SLP-H423DCP20	Sealed Power H423DCP 20 Speed-Pro Hypereutectic Pistons | Summit Racing Free Shipping - Speed-Pro Hypereutectic Pistons with qualifying orders of $99. Shop Pistons at Summit Racing. www.summitracing.com
7	Sealed Power Performance Piston Ring	SLP-E-251K20	Sealed Power E-251K20 Sealed Power Performance Piston Ring Sets | Summit Racing Free Shipping - Sealed Power Performance Piston Ring Sets with qualifying orders of $99. Shop Piston Rings at Summit Racing. www.summitracing.com
8	COMP Cams High Energy Hydraulic Roller Lifters	CCA-850-16	COMP Cams 850-16 Free Shipping - COMP Cams 850-16 with qualifying orders of $99. Shop Lifters at Summit Racing. www.summitracing.com
9	Timken Timing Cover Seals	TMK-9845	Timken 9845 Free Shipping - Timken 9845 with qualifying orders of $99. Shop Timing Cover Seals at Summit Racing. www.summitracing.com
10	Melling High-Volume Oil Pump	MEL-M55HV	Melling M-55HV Melling High-Volume Oil Pumps | Summit Racing Free Shipping - Melling High-Volume Oil Pumps with qualifying orders of $109. Shop Oil Pumps at Summit Racing. www.summitracing.com
11	Fuel Pump Block off plate	SUM-420001	Summit Racing SUM-420001 Free Shipping - Summit Racing SUM-420001 with qualifying orders of $99. Shop Fuel Pump Block-Off Plates at Summit Racing. www.summitracing.com
12	Push rods	measure first
13	Fel-Pro Performance Marine Head Gaskets	FEL-17030	Fel-Pro 17030 Free Shipping - Fel-Pro 17030 with qualifying orders of $99. Shop Head Gaskets at Summit Racing. www.summitracing.com
14	hed bolts	ARP-1343601	ARP 134-3601 ARP High Performance Series Cylinder Head Bolt Kits | Summit Racing Free Shipping - ARP High Performance Series Cylinder Head Bolt Kits with qualifying orders of $99. Shop Cylinder Head Fasteners at Summit Racing. www.summitracing.com
15	Exhaust Manifold Gaskets	FEL-1405	Fel-Pro 1405 Fel-Pro Performance Exhaust Header Gasket Sets | Summit Racing Free Shipping - Fel-Pro Performance Exhaust Header Gasket Sets with qualifying orders of $99. Shop Header and Exhaust Manifold Gaskets at Summit Racing. www.summitracing.com
16	water pump gasket	SCE-21101	SCE Gaskets 21101 Free Shipping - SCE Gaskets 21101 with qualifying orders of $99. Shop Water Pump Gaskets at Summit Racing. www.summitracing.com
17	Torque Fastener Assembly Lubricant	ARP-1009909	ARP 100-9909 ARP Ultra Torque Fastener Assembly Lubricant | Summit Racing Free Shipping - ARP Ultra Torque Fastener Assembly Lubricant with qualifying orders of $99. Shop Assembly Lubricant at Summit Racing. www.summitracing.com
18	Silicone Gasket Maker	PTX-82180	Permatex 82180 Permatex Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker | Summit Racing Free Shipping - Permatex Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker with qualifying orders of $99. Shop RTV at Summit Racing. www.summitracing.com
19	Reluctor ring	ADO-10190917	ACDelco 10190917 ACDelco GM Genuine Parts Crankshaft Position Sensor Reluctor Rings | Summit Racing Free Shipping - ACDelco GM Genuine Parts Crankshaft Position Sensor Reluctor Rings with qualifying orders of $109. Shop Crankshaft Reluctor Wheels at Summit Racing. www.summitracing.com
20	assembly prelube	CCA-153 / SLP-55403B	Sealed Power 55-403B Free Shipping - Sealed Power 55-403B with qualifying orders of $99. Shop Assembly Lubricant at Summit Racing. www.summitracing.com
21	Spark Plugs BKR5EIX	MSD-3724	MSD Ignition 3724 Free Shipping - MSD Ignition 3724 with qualifying orders of $99. Shop Spark Plugs at Summit Racing. www.summitracing.com
22	Roller tip rocker arms	CCA-1418-16	COMP Cams 1418-16 COMP Cams Magnum Roller Tip Rocker Arms | Summit Racing Free Shipping - COMP Cams Magnum Roller Tip Rocker Arms with qualifying orders of $99. Shop Rocker Arms at Summit Racing. www.summitracing.com
23	Valve springs	CCA-981-16	COMP Cams 981-16 Free Shipping - COMP Cams 981-16 with qualifying orders of $99. Shop Valve Springs at Summit Racing. www.summitracing.com
24	Valves Exhaust 1.60	SUM-V8010-8	Summit Racing SUM-V8010-8 Free Shipping - Summit Racing SUM-V8010-8 with qualifying orders of $99. Shop Valves at Summit Racing. www.summitracing.com
25	Valves Intake 2.02	SUM-V8002-8	Summit Racing SUM-V8002-8 Free Shipping - Summit Racing SUM-V8002-8 with qualifying orders of $99. Shop Valves at Summit Racing. www.summitracing.com
	Timing Chain?

 

[Scott Danforth]

Look at a comp cams K-kit where everthing comes as one box. It is usually a better deal

 

[bollerwagon]

Look at a comp cams K-kit where everthing comes as one box. It is usually a better deal

can you be more specific? What is a k-kit? are there differerent ones? which one is recommended?

 

[Scott Danforth]

can you be more specific? What is a k-kit? are there differerent ones? which one is recommended?

A k-kit is cam, lifters, springs, timing chain, etc. Look up the cam you want on comps web site

 

[Scott06]

can you be more specific? What is a k-kit? are there differerent ones? which one is recommended?

This is a K kit for BBC but you get the idea has springs retainers etc that should work together. Should eliminate any mismatch issues like wrong springs etc. Make sure the machinist checks the valve spring, retainer, seal clearance installed height etc. You never know what was done to the heads previously. I replaced the cam in my 65 GTO and when I had it apart the guy who did the last valve job screwed up his measurements so with stock cam retainer was kissing the teflon seals he installed. By the books the slightly higher lift cam I was installing should have worked with stock valve train. I would have broken something had I not checked this.

Xtreme Energy 206/212 Hydraulic Roller K-Kit for Chevrolet Big Block GEN VI

Xtreme Energy 206/212 Hydraulic Roller K-Kit for Chevy Big Block GEN VI. Great low end torque. Good for towing or in RV. Works with stock intake and exhaust.

www.compcams.com

 

[Scott Danforth]

work with your machine shop. you need to bore/hone/line-hone and deck the block and check bearings prior to buying parts

pick the appropriate cam K-kit. https://www.compcams.com/products/c...der-o.e.-roller-(1987-1998)/usage/marine.html

this is the largest cam you can go with on a wet exhaust. https://www.compcams.com/xtreme-marine-218-224-hydraulic-roller-k-kit-for-oe-roller-sbc.html

 

[bollerwagon]

Look at a comp cams K-kit where everthing comes as one box. It is usually a better deal

But was the idea to safe some money? Because sticking to the original parts seems to be the more economical choice.

 

[alldodge]

But was the idea to safe some money? Because sticking to the original parts seems to be the more economical choice.

If your going original rebuild don't use item 10
Don't need high volume nore want

 

[bollerwagon]

What’s wrong with higher oil flow?

 

[alldodge]

Bearing clearances need to be sized for it, and return oil channels from the heads need to be sized so it can take the return. Then need an oil pan large enough so you don't run out.

Need to block off the bypass on the block otherwise all the extra oil dumps back to the pan so increasing heat with no added value. Remote oil filter lines need to be at least AN-8 but -10 is better.

Your going to see about 100 psi at cold idle and would drop around 80 after warmed up

 

[Scott Danforth]

But was the idea to safe some money? Because sticking to the original parts seems to be the more economical choice.

if you want to save money, find a low mileage 1996-2000 truck with a 5.7 and buy the motor for $125, then swap the core plugs and head gaskets.

roller tip rockers are not needed, and you shouldnt need valves, because if your motor needs valve, the valve seats are probably toast. at that point, new fully assembled heads would be the lowest cost.

 

[bollerwagon]

That is not really an option over here. Assuming I will bore mine and can reuse cam and crank. Skipping the oil pump upgrade if not needed. can I work with the list above or are there improvements to make?

 

[Scott Danforth]

That is not really an option over here. Assuming I will bore mine and can reuse cam and crank. Skipping the oil pump upgrade if not needed. can I work with the list above or are there improvements to make?

if you are re-using your cam, you can re-use the lifters. just keep the lifters labeled. would also suggest you mic the cam bearings as they rarely need changing unless you are going to fire-clean the block

if you are re-using a crank, a new crank is about the same cost as reconditioning your current crank.

I would re-use your existing stamped rockers, springs, valves, etc if you are using the existing cam and just have the heads inspected

Stock GM head bolts are only $35 a set vs the ARP head studs which are not needed on a stock motor

 

[bollerwagon]

I had the engine at a workshop and since I don´t have any expertise, I do as they say. They say, they want to remove the freeze plugs, since the ultra sonic bath will be able to remove more rust and stuff then.
Cam will be checked it it´s okay, so far it loos fine and bust needs some polish at the spots where it touches the bearings.
They said to replace the cam bearings and put back in the cam (about 150 USD by the way)

I labelled the lifters and the direction, I was just told to replace them. If you say that´s not needed, I won´t.

The GXi has the roller tip rockers to crank out 20 more horsepower. This costs 250 USD, and it will be a all original GXi block. This is why I´d vote for this upgrade.

Headbolts were picked by summit, do you know the part numer of the stock parts?

How about the pistons, are those a good pick?

If there are other parts that improve power or fuel efficency (gas is about 8.20 USD per gallon here) for a small surcharge, I am open to it!

 

[Scott Danforth]

I had the engine at a workshop and since I don´t have any expertise, I do as they say. They say, they want to remove the freeze plugs, since the ultra sonic bath will be able to remove more rust and stuff then.
Cam will be checked it it´s okay, so far it loos fine and bust needs some polish at the spots where it touches the bearings.
They said to replace the cam bearings and put back in the cam (about 150 USD by the way)

I labelled the lifters and the direction, I was just told to replace them. If you say that´s not needed, I won´t.

The GXi has the roller tip rockers to crank out 20 more horsepower. This costs 250 USD, and it will be a all original GXi block. This is why I´d vote for this upgrade.

Headbolts were picked by summit, do you know the part numer of the stock parts?

How about the pistons, are those a good pick?

If there are other parts that improve power or fuel efficency (gas is about 8.20 USD per gallon here) for a small surcharge, I am open to it!

roller tip rockers do not give you 20hp. going from a 1.5:1 to 1.6:1 rockers can add power. the roller tip just reduces friction.

only thing to improve fuel efficiency is oars or sails. internal combustion 4-stroke motors burn 0.4# of fuel per HP per hr. so if you make power, you burn fuel

here are all the summit head bolts

Small Block Chevy 350 Parts & Accessories | Summit Racing

Find CHEVROLET 5.7L/350 Chevy small block Gen I Parts and Accessories head bolts KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing!

www.summitracing.com

here are the GM labeled head bolts at $54 https://www.summitracing.com/parts/nal-12495499/make/chevrolet

Here is where GM buys most of their parts from for $25 (what I buy for stock motors) https://www.summitracing.com/parts/mah-gs33285/make/chevrolet

here are the 1.5:1 roller tip rockers https://www.summitracing.com/search...ortOrder=Ascending&keyword=roller tip rockers

here are the 1.6:1 roller tip rockers https://www.summitracing.com/search...ortOrder=Ascending&keyword=roller tip rockers

 

[bollerwagon]

Gentlemen, will it or won´t suck my pan dry? I have a melling M55HV already and a spring to reduce it to standard pressure (instead of high pressure). Can I just drop it in without having a problem?

a high volume oil pump from melling (and no, it wont suck your pan dry) https://www.melling.com/product/gm-cast-iron-oil-pump-select-performance/

Bearing clearances need to be sized for it, and return oil channels from the heads need to be sized so it can take the return. Then need an oil pan large enough so you don't run out.

Need to block off the bypass on the block otherwise all the extra oil dumps back to the pan so increasing heat with no added value. Remote oil filter lines need to be at least AN-8 but -10 is better.

Your going to see about 100 psi at cold idle and would drop around 80 after warmed up

 

[Scott Danforth]

I ran the stock M55HV on my 271C after I upgrated the cam and vortec heads and never had a problem.

 

[bollerwagon]

I´ve ordered the stuff now. I wonder what I forgot and if it will work...
Any idea, where I can get a cheap closed cooling set for the MPI and the 271C?

 

[Scott Danforth]

If you want cheap, it wont be good. If you want good, it wont be cheap

Suggest san juan (now orca) or find a complete CHAMP setup

 

[bollerwagon]

The heads from the AQ271C are being machined, they got new valves also.
What´s confusing is that the exhaust valves are not really deap in their seat, they seem to stay right in the fire.
I have no expertise here, it just feels wrong. Or at least not ideal. But I think it wasa pretty similar with the old valves too.
Ideas, anyone?