thesargster4

iTrader: (1)

Swaping a L98 into my bro's 85.. need a prom for my ecu!

Please, anyone let me know!

Reply, dont PM. my brother is the one needing it, so he's watching the post!

John

my82roc

iTrader: (101)

There was no L98 in 1985.The stock ecm for an 85 will be no good.You will need an 86-89 (165)ecm for an maf setup or a 90-92 (730)ecm for speed density setup.I have a 165 ecm with a stock L98 5.7 prom that I would sell for 100 dollars+shipping

thesargster4

iTrader: (1)

Is all the wiring the same? If so were interested.

FireDemonSiC

I'm gonna be buying a 350 SBC out of a 72 pickup and swap the TPI intake from my 305 and toss in an L98 cam.

If this will work for my application, I'll take it.

my82roc

iTrader: (101)

Im not really sure.Maybe someone else could answer that

vasquezmrysvll

iTrader: (5)

pm sent

87zjeff

iTrader: (4)

you won't be able to put a factory L98 cam into that block. that block uses flat tappet lifters and a factory L98 cam uses roller lifters. also you will need bigger injectors as well as the MAF sensor for the '86-'89 motor because if i'm not mistaken, the '85 is a different MAF type(digital vs. analog)

FireDemonSiC

Hold the phone. What won't work? If I just spent all the money for this swap and I've been told wrong, I'm gonna be highly pissed.

Heres what I've bought.


- Comp Cams Flat Tappet 12-338-4 camshaft

- Comp Cams Flat Tappet hydraulic lifters

- PROM from an 85 L98 corvette.

- Denso IT16 iridium spark plugs

- New flat tappet pushrods

- 350 Knock sensor


The only issue is the injectors. I can't afford #24 injectors for about a month and I know that the stock 305 ones will make the engine run lean. Can this actually damage the engine or just choke It's power?

vasquezmrysvll

iTrader: (5)

your parts are very much compatible with the L98 NON-ROLLER block. i ran my 350 .040 over for about 4 weeks now on my stock #19's. you will be ok til you can afford bigger injectors im installing my 24'/s tommorrow. i only got a LEAN O2 reading when i jumped on it.

87zjeff

iTrader: (4)

they only made L98 for a year or two(in the vette's) before going to roller cams. when you say L98 on this board, most assume roller cam/block since that was the common 5.7 in these cars used with tpi set-ups.

the flat tappet cam you have will work in the block you are using. if you have the prom from a '85 vette(you didn't mention it before) then use it instead of converting to the '165 stuff and you won't need another MAF sensor.