CC'd my new heads

How much is it now?
You pump it from the pump outside or they sell the 5 gal cans?

 

Just ordered it from Rock Auto, 212.93 for next day, be here tomorrow morning LOLOLOL, just kidding, 10.99 snail mail

 

Michael's has a pump you bring your own can. The only other place I know for us which would be far for you but not far fro Dragway 42 is Rocky's Gas station right across the street from Barberton High school the gas was 8-9.00$ a gal las time I was there and regular gas was 4.00$ then. 2021

 

Hey guys, have a question.

At 12-1 compression, how do you handle any detonation issues?
Reason why I ask. I purchased a 70 Buick GS 455 in July of 2021.

Spent a lot of time & money dealing with dedonation issues.

Unfortunately, wasn't told about these issues before I bought the GS. Found out the former owner was using octane booster to reduce dedonation.
Could be the reason why he put it up for sale.

It looks like you are mixing race gas with 93 octane.
My Buick is a daily driver but I found out that high compression pistons were installed by the previous owner. I drove the car from the shop for the first time in 17 months,
On a 90 degree day with A/C running.
My mechanic has done a great job of eliminating the dedonation issues.

Is it possible just use 93 octane on 12-1 compression??? VET (Navy)

 

Unless he did ALOT of work to the engine, it isn't 12:1 compression. If it is 10.5:1 compression, 93 octane should be good enough to stop detonation in a decently maintained engine. If it is stock, it likely closer to 9.5:1 compression.

 

Thank you. I talked with Larry the Wiszard.
He identified the pistons in my car, they are older Kenny Bell's with valve reliefs. They might be 10-1 compression, but, Larry said I would have to pull the heads to measure the piston to deck, to know the real compression.
I really don't want to do that, but it looks like all working out.
I'am having a new HD thermostatic fan church installed that I bought from Todd Miller. The Delco HD fan clutch did a great job but it roared very load, looks to be defective.
Thank you for your input. VET

 

I have a theory on this and I’m not an engineer LOL.
The torque converter I believe has quite a bit to do with it.
At idle with the engine under no load the engine won’t detonate, free revving it won’t detonate, but put it under a load, it will detonate, higher stall converters lessen the load the engine sees up to a point, that point being keeping at full throttle going down the race track. Larry suggested to me a few years ago to dump in 5 gal of race gas for track runs for insurance against detonation since you more than likely won’t hear it with all the other noise going on.
There are other areas such as ignition timing, A/F ratio, operating temp, weather conditions that all play a role in hedging off detonation OR aggravate it.
It’s a fine line for sure. My last build was fine at 11.1 to 1 we’ll see how she does a bit higher

 

Problem is you cannot hear that detonation while going down the track in 3rd gear. I only have 10.6 comp and I have used the 5 gal of race gas with fill up.
Use an adjustable vac advance to help curb the detonation during those off idle cruise or climbing up hill. I use the YR5 NGK for nitrous and those plugs are not extended like the UR5 NGK that is normally used.
I have had good luck with the YR5 plug does not foul out as long as you are driving more than idling. I have noticed if I am just starting car up and letting it idle more than driving they will get some oil fouling from sitting and guides leaking some. Once out driving for a few miles they seem to stay clean so you may want to try the YR5 NGK if you have trouble with the detonation.

 

What's your DCR at now??? Your cam is kinda dinky on the overlap.

 

My mechanic installed that adjustable vac advance.
Never seen an adjustable one before but works great. Also installed an MSD system, total advance is now 32 degrees, former owner had it at 42 degrees (wow), way too much.
Been running great. VET (Navy)

 

Lolol I have no clue

 

You go Larry!

 

Larry, while your waiting, do a dbl check on mine please... 3.831 bore, 3.998 stroke, 1.850 piston comp hgt, .013 in hole, 10.214 deck hgt, 6.350 rod length, .056 cc chambers, 13cc dish, 3.800 head gskt dia, @ .020 thickness.

 

I do know I had called Jim Weise and had asked him on his cam recommendations, all I remember him saying was a cam around 230/240 duration.
On the cam card when I received my roller the lift calculation was wrong and the “install at” line was blank????

 

Pistons sit .005 in the hole

 

They sit .005 in the hole, yes it was decked.
Yes that’s my cam.