Engine/Transmission (1994 - 1998) DDP4's lower power than 370's???

[KHaines]

I bought a set of used DDP stage 4's to replace 370's. Now the truck smokes more and has less power. Any ideas? When I changed injectors, I used the thinner washers.



1997 12 valve

rebuilt engine balanced, o rings, 370 pistons

215 pump 100 plate forward

3k GSK

piers cam

 

[zstroken]

DDP4 should have more HP than the 370's. Depends on how old they are. The early DDP4's actually are the same size as the DDP3's. As always buying used, perhaps they aren't DDP4's??

 

[supersonic]

I'd call DD and see what they would suggest to set the timing at with the marine pistons.

 

[KHaines]

I have a HTB2 Street Stock 62 Turbo. Should I have a bigger turbo? Maybe a 71 series?

 

[zstroken]

What have you done with the pump?

 

[Joseph Donnelly]

It is common for honed injectors from most companies to smoke more. Black or white smoke? Also, the 370 pistons lower compression a lot. If the block wasn't decked, you might be around 15. 2-15. 5 to 1. Even if decked . 010 to . 020" with the thin stock head gasket (3283335), you probably won't reach 16 to 1. The lower compression is OK for maximum power, but drivability, espcially cold, will not be as good. You will get a trail of white smoke (unburned fuel) until it warms up. Gray smoke means a mixture of white and black (partially burned fuel).