madmike9396

iTrader: (29)

Are the heads 243 or 799 op ?

skidder07

no 706 heads.

cam

iTrader: (9)

4.8's are fun little engines too but with above I wouldnt spend any coin on aftermarket heads etc. Cam only? Sure why not. Something like a 218/222 XE lobe comp with PAC 1218 springs, new pushrods and some long tube headers + decent exhaust will be a stout little package. Leave stock heads, intake, throttle body, ecm etc etc etc but add a decent stall if running auto.

Then build a bigger cube engine while driving this one to swap later if you find the power isnt enough for you.

skidder07

I've been building the truck for about 4years and will soon need a engine and transmission installed.

big hammer

Id build an NA 4.8.... Would be fun.

BUT, it would be a low torque, high rpm sleeper. Ported 243's and the right cam and intake and you have yourself a 7800 rpm screamer.

Great and fun for a light car, not so much for a heavy truck.

But with boost those 4.8's are animals.

skidder07

by the noise of it i should just find a 6L or a ls3, also should i stay away from dod engines. whats better 53 tooth or 24 tooth?

transamtom

iTrader: (8)

The 24x crank is the older system and uses a slightly slower ECM.

The 58X is the current system.

DOD was available on almost all truck motors it can be tuned out or physically removed.

If your using a 24x ECM the DOD has to be physically removed its not compatible.

jprince

4.8 suuupppeerrr strong fun engine.. Yes notba "huge" HP engine but yeah 400 definitely achievable. I think they are base at 280ish?? Boost it.. For half the price of a Na build.. 8 psi, good tune very streetable 475-500

skidder07

so find a engine with 58 teeth.

jprince

I guess but I've had 2 5.3's both 24 tooth and they run great .. I don't know if there is a real big noticeable difference .. Please someone chime in i would actually like to know ..

transamtom

iTrader: (8)

There is no right or wrong.

GM went 58x crank and 4x cam for emissions and better control of spark,cam timing ect.

Build what ever you find cheapest if you blow up a 24X and you want to swap a 58X later Lingenfelter sells an adapter box to change the signal.

skidder07

so i could just use the 4.8/5.3 block put 5.3 rotating assembly in with a 58 teeth adapter.

transamtom

iTrader: (8)

The reluctor wheel is mounted on the crank.

The crank can be used in a 4.8/5.3 the pistons are not interchangeable the 4.8 bore is smaller.

fastcars95

iTrader: (9)

I have a gen 4 4.8 sitting on a stand now if you interested that I robbed the 799s off of.
Super clean. Low k from a 2012. I'll sell it cheap cheap.
I need the engine stand for a buddy

skidder07

I have a 4.8 sitting my shop. That's why I'm asking if it's worth building or should I build a 6L