1976 135 vs 1975 115

[JRegier]

Hey everyone; I'm hoping someone could help me; I've got a 1975 115 'rude and a 1976 135 and was wondering if they had the same intake and exhaust porting and if the difference was only in the bubbleback exhaust and carbs?

In summary; will the 135 bubbleback exhaust and carburetors turn the 115 into a 135?

 

[F_R]

Cylinder heads are different. And I don't know what else without doing a bunch of research.

 

[Faztbullet]

In summary; will the 135 bubbleback exhaust and carburetors turn the 115 into a 135?

Not really as to do it correctly and get maximum performance/results the exhaust divider will need cut and the exhaust deflectors installed and rear of block milled so deflectors and block is same height, Remember these are HP rated at powerhead so your 115 is 85-90hp at prop and the 135 is 110-115hp at prop.

 

[JRegier]

Oh, ok. I didn't realize the 135 had exhaust deflectors.

 

[emdsapmgr]

The cut exhaust divider first appeared on the 140 crossflows. That was the primary hp difference between the 135 and the 140, along with the rubber intake manifold (filler blocks) stuffers. Keep in mind the 135 heads were some of the tightest heads put on production crossflows. Little will compare to them. Esp the early 135's.