Jan1980

Hello.

I have to build a 355 SBC from my old 383 SBC. So i have to change the crankshaft, the connecting rods and the pistons. I think, i want to reuse most of the "old" parts.

- 4.030" bored block of course
- AFR 195 (#1040) heads
- 1:1,6 roller rockers and push rods
- Edelbrock Airgap intake manifold with TBI adapter plate
- 454 TBI ported throttlebody with 80´injectors (not sure for reusing, please take a look to my other thread in this forum)
- 4" snorkle homemade air cleaner (bought from a thirdgen-member before a few years)
- Rob´s great EBL
- Zeitronix WBO2
- Flowmaster American thunder exhaust system 3" with high flow cat
- heavy duty oilpump

Followings parts will not be reused:

- Eagle Stroker 383 rotating assembly with harmonic balancer
- 7 qt oilpan ( big pan, terrible y-pipe construction at the moment)
- Stroker 383 valve covers (silly to use them on a 355 cui engine)
- Old headers and ypipe (terrible in cause of the big oilpan)


I ordered the following parts:

- Scat crankshaft
- Badger pistons 4.030"
- New connecting rods 5.7"
- headers and y-pipe from topdown-solutions
- Bearings, piston rings, gasket and other small things...


So, i bought the 383 sbc shortblock before a few years. A friend of me bought the same shortblock for his TransAM. I asked him for cam specifications. They should be:

Mike Jones cam design
280/286 duration; 224/226 @0.05
lift .535 intake; .528 exhaust with 1:1.6 roller rockers
110 degrees lobe centerline.

How do you think about my setup ? Of course, i have to remove the engine from the car and disassembling completely.. So, the big question is, how do you think about the cam specs ?


thank you

Jan

RFmaster

Your camshaft (224/226 @0.05 lift .535 intake; .528 exhaust with 1:1.6 roller rockers
110 degrees lobe centerline) will result in low idle vacuum which is going to be PITA to tune. For comparison sake take look at LT1/LT4 cam spec @ 0.05 220/230 deg / Lift 0.510/0.510, LSA 114deg. It can be argued that 383 can easily handle 220 to 240 deg of duration, but tight LSA angle is better suited for Carb engine operating above 4000 RPM most of the time. I would ask Mike Jones what was the intended application for that cam before moving forward.

//RF

Jan1980

What do you mean with PITA ? Which camshaft would you recommend for my setup ?

RFmaster

1) PITA definition
http://www.acronymfinder.com/PITA.html

2) Does your block has provision for a roller camshaft?

Jan1980

My block is a rollerblock with 1-piece-mainseal from 1989.

mmadden55

Why are you destroking a 383 to a 355? The 383 will make more power.

Jan1980

I´ve got trouble with german TUEV to enter the 383 engine. I have to pay 10000 Euro, if i want to enter the stroker engine. For 350/355, i have just to pay 300 Euro to enter for proper papers. So, i decided me to go this way...