also i have 317 heads on it i was thinking of going with 799 heads for compression but do they flow as well as 317 and have the same size valves, i was thinking going with 799s going with bigger valves and porting them to a truck intake with a 4 bolt tb

 

how dose this thing do on the street with that cam haven't seen many use 111 lsa with efi now my carbed 383 i ran had a 108 lsa and 246 deg durration and thats why i got rid of the power brakes i'm getting older and also know these ls engines don't need as much cam as the old small blocks did to make the same or more power this isn't a daily driver anymore bought a fiesta for that but i do drive it on the street and the closest track is about 100 miles away i would apreciate your feed back on your street manerisums

 

I'd look around for a good set of used ported 243s/799s. I wouldn't buy them w/o a flow sheet though. I've seen some great deals on used heads, ported stock castings and aftermarket castings.

Definitely on the right track with a 90mm intake. Whether it be a tbss or nnbs. Ive read threads where people ported these intakes and showed big gains. Like fast intake gains.

I was going to run some t.e.a. ported 243s on my lq9. After totaling up the cost of buying cores, shipping to t.e.a., having them ported, shipping them to me; It was the same money a friend of mine was asking for a set of used afr225s with new pac springs. So I went with the afr's.

This is what my truck did on a dyno with a larger cam in a lq9 with stock 317s: https://www.performancetrucks.net/fo...esults-472581/

 

My LQ4 makes 407rwhp through a 95% stock 4L65E and 3:73's on 285/50R20's. My Setup:

Stock LQ4
Stock 243's
TSP 224-112 cam
PAC Racing Valvesprings
Manley PR's
NNBS Flex Fuel-Intakes/Injectors/TB
Volant CAI
IAT Relocate
OBX Lt's
2.5" dual exhaust with x pipe and magnapack mufflers
Tr-55 spark plugs
Custom Tune by me

 

Very soon, I'm gonna pull the heads, intake and TB to give a little massaging to and hopefully hit 425-430rwhp.

 

it runs good idles fine haven't had any idle surging or anything like that its all in the tune

 

My truck runs 12.7 rolling off the line. I have a pretty small cam and at the time i had a 3200 278mm converter. The rest of the mods are in my sig. I bet my little lq9 puts down 360-370ish.

 

things just changed i found a set of 243 heads for $450 couldn't pass them up i think i might have those worked on bigger valves porting and port match intake and headers I found a shop localy they have a good price it was $860 for my 317 heads, already have valve springs, i need to do more research into them but they seemed to be prety knowlegeable next step is to get that tbss intake i'll be able to buy one next friday, and the cam change is a must I realy like that TR-224 112 lsa with 560 lift also i know i need a converter box for the throttle body but will the MAFF plug in or do i need an adapter for that don't see the poing in bigger tb without MAFF to match

 

also are the injectors different on the intakes with the 4 bolt throttle bodies or are they the same as the ones on 3 bolt intakes

 

there the same, put some 8.1 injectors in. they are a direct swap