Check this beauty out! Head Gaskets

[bcn30141]

I'm also leaning towards the idea that my blow out had something to do with not having any wide band input.... I have a Gen2...thinkin g of getting a NGK wide band set up and plugging it into the auxiliary of my gen 2...take out the TT chip and put in a extender chip from full throttle. Just input my desired air fuel and go with it...any thoughts? I remember keeping the air fuel around 12:1 on my supercharged car...what is best for the buick turbo? Thanks!

[PacecarTA]

12:1 A/F aint it  maybe at 12-14psi youll be ok
do that and youll be doing those gaskets  over  again

my target on alky/ 93(its 10% ethanol blended already)  is 10.5 A/F and timing at 18-19 degrees
and that 10.5 being its a  mix of alky and fuel is based on having enough temp drop from alky and enough fuel to support the hp without alky
 

take your injector rating x injectory duty at traps  and youll have the flow per injector,   x 6 (injectors) ,  x2 (bsfc.5lb per hp)...   should=HP
take your mph and weight and figure the HP,plenty of online HP charts out there .
the fuel numbers should match  provided you maintained the AF ,fuel pressure stayed 1:1 during run and your boost wasnt a runaway and was somewhat under control,
  too low on fuel means and you have too much alky ,
  too high on fuel you dont have enough alky

its also a good idea to log the air temp at plenum so you can evaluate the alky effect ,  i look for ambient or withing 10 degrees during a pass , in winter 10 degrees warmer is ok  , in summer 10 degrees cooler is ok
 

[Steve Wood]

After 12 years of playing with widebands, I have come to the conclusion that there is no magic in a wideband unless one has a fully programmable aftermarket fuel management system and the knowledge to use it properly.

Using the factory ecm, one tunes just like he does with the narrow band factory sensor-As lean as possible without any timing retard from detonation..  Obviously this depends upon ambient conditions, quality of fuel, amount of alky sprayed, engine combination,street, strip, or wot to top end, etc.

One tunes for the worst case in the intended use.  Typically, this might be some where in the upper tens a/f wise.

Those who tune to a magic number given to them by someone else tend to either go slow or blow them up.

[bcn30141]

1.94 1.50 ported irons and my block I'm proud of which has been balanced through and through. I also found a kink in the fuel line leading up to the rail...maybe that was my detonation creater....

[bcn30141]

Pistons cleaned up

[phil_long]

That cobra is a beaut!!  I've always loved those things

[bcn30141]

Heads cleaned up...looking forward to installing stud and roller kit....I'm not sure if I will need a new rocker assembly, not even sure if mine is stock....I need to learn about rocker sizes and types, if I can use mine or if I have to get another etc etc

[larrym]

you can use stock rockers with a roller cam I would at least use braces (saddles) the stock shafts tend to break with the extra spring pressure and you have to measure your pushrods to get the correct preload.

[PacecarTA]

FYI your 1.94 intake valves look an awful lot like stock  (hell they even have the GM casting) ,  might want to take a caliper to that

[bcn30141]

They are Chevy intake valves from small block V8. They are stamped GM. I haven't calipered them before though....when I put in the new springs for the cam I'll check that out.

[bcn30141]

Well at least that's what a parts list on a receipt said.....so I calipered them and they show a size of 1.7 something...th at's a bit short of 1.94... Oh well, I'm not special any more lol

[bcn30141]

Pace car is it needed to relap valves or just keep them matched up.?thanks

[Steve Wood]

wonder how much trouble those G.M.'s  can cause?

[PacecarTA]

for roller cam  , the cam is a drop in the block (unless its a billet then you had better do your homework ) but the heads need to be prepped for the cam lift
 youll want to cut the exhaust valve guide down for clearance as well as PC seals the exhaust valves should be replaced because the stock ones have a groove cut into them for oiling and a PC seal wont work with the stock valve , so you need to swap them out for a valve without a grooved stem  (the TTA exhaust valve , manley or ferrea valve)

just so you know to fit a 1.94 on stock iron heads requires moving the valve guides over. 


 you will need new springs for a roller cam and new pushrods measured for fit after the heads and cam are installed ...dont assume the vendor sent you what you need in regards to adequate spring pressure  or pushrod ..measure first
if you want to do roller rockers youll need to clearance the pedastils and measure for pushrods with the rockers you intend to run ,  stock and roller rockers take different length pushrods and the adjusters arent there to fix measurement errors , they are there to obtain closer preload matching and to get preloads closer to zero lash on performance lifters ..oh yeah.. all roller lifters arent created equal or take the  same preload


as far as heads go the champion irons out of the box are hard to beat for the price , 1.775 1.50 valves , cnc ported ,  they will do springs for what you need  ready for most roller cams -valve guides cut with pc seals- pedastils clearanced for roller rockers, head surface ready for MLS gaskets  and the vc rail smoothed   , they have been 9s and faster

[bcn30141]

I was looking at this kit from full throttle...the y say I can use stock rockers....