Top Swapped Pulley drop VS L67 Pulley Drop

[BoostedPontiac]

All i really want to know is how much of a difference a 3.4 is on a 8.5 (L67) compression block vs a 9.4 compression block (L36).

Would running a 3.4 on the top swap be similar to running a 3.3-3.2 on a GTP engine as far as supporting mods go?

 

[SgtMarshal]

a top swapped car makes about 20 more horsepower than an L67 on the same pulley, that is if there are enough flow mods. what goes in must come out.

 

[NebTurboST5]

you're correct. 3.4=3.2 on a top swap car.

 

[Scottydoggs]

a 3.4 pulley is really pushing it. a ic would be best.

i had a rocker, 3.4 l67. the l36 top swap with rockers and the stock pulley would have blown the l67's doors off.

i tried the 3.4 on the top swap, i was getting tons of KR at part throttle. and im talking 1/4 throttle. 6º kr

 

[BoostedPontiac]

6* at 25%? Holy crap. Im on a 3.3 and see no knock.

 

[Scottydoggs]

you have a cam.

i got no real mods other then the headers and the rockers. heads are lightly ported but clearly that didnt help.

ic will be paid for on friday night :th_sinister: let the pulley dropping commence.........

 

[Fivefingerdeathpunch]

Just because you saw knock, doesnt mean everyone will.

Lots of people might be able to get away without a intercooler.

 

[jayroca]

Just because you saw knock, doesnt mean everyone will.

Lots of people might be able to get away without a intercooler.

This.
Im on a 2.8 with no knock on a e85 cam and genv with no intercooler i will get one before the year is over to dyno and drop to a 2.6

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[buck531]

The blue POS is on a 3.2 with roughly 9.5-10 lbs of boost with headers, and slightly ported heads and an XP. Once I figure out my fueling I'll try my 3.0 but I'd rather play it safe for now.

Now the 03 has an IC and I see blips of KR with rockers and a full size intercooler/headers, etc. about 10-12 lbs of boost.