I ask this because I read about IHRA Pro Stock running in the low 6's at 220+MPH.
Do they allow bigger inch motors or what?

Bigger Engines!!!!!!!!!!!!!!1

NHRA pro stock has a limit of 500 cubic inches.

IHRA has mountain motor rules which mean there is no motor limit. So they have bigger inches which means faster times.

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I believe the IHRA cubic inch limits are still at 826 cubic inches for a hemi style head and 840 cubic inches on the wedge stuff.
Plus the IHRA stuff can have a 5.0 bore space engine, which in turn makes a much larger bore, which in turn allows a larger intake valve and increased air flow. Split carbs allow better placement of the venturi over the intake port and better geometry there.
Then everything else stems from that. The chassis are more rigid to overcome the increased torque. longer spoiler by 2" (If I am remembering correctly. doing this off the top of my head.) And 10" longer wheelie bars. The clutches are different obviously, and the transmissions as well.
Without getting too technical, that is about it.

Wow, I guess that demonstrates how it takes a whole lot of extra power just to go a little faster and quicker.
The increased bore spacing answers another question I've had about the split carbs. Neat stuff.

IHRA Pro Stock is also a better show than NHRA Pro Stock.

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Agreed. Throw Ford into the mix and it makes for alot of ford vs. chev vs. dodge(albeit only 1 dodge) racing. Should be exciting this weekend at the rock as I think a few guys have a shot at winning the title at the season ender.

sometimes i wonder what would guys like GA,WJ and others would do if they built 800+ cubes and went up against the mountain motor guys in IHRA!!!

probably about the same as now.... but it would take them a couple weekends of trying... to get use to the difference...

i just came in form the Strip at Rockingham,, and that place is packed.... lots of PS cars... shoudl be a great rae to watch this weekend..

Billy

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They did great over there!! WJ, Bob Glidden(?), Lee Sheperd, were all world Champs In the IHRA in the eighties. Although the engines were smaller (600-700(?))than they are now, these guy's were players in the moutain motor p/s class!!!! Hell, Lee Sheperd won both the NHRA/IHRA titles in the same year(I think). Rickie Smith was voted #1 Mountain Motor P/S driver earlier this year.

I totally agree. Nothing, in my opinion, sounds meaner than an IHRA Pro Stock at idle. I am glad that Torco is drastically increasing the Shootout purse next year for this class.

I like to hear the air sucking in from all over the county into one of these 800+ inch pro stock motors at idle. What a terric and unique sound.

jim

"What's the diff between NHRA and IHRA Pro Stock cars?"

About $20.00... and about 2000 RPM???

When Glidden, et. al, were running IHRA, they ran their NHRA-legal cars with a weight-break. Buddy Ingersoll also opened some eyes by running competitive times in a turbocharged, small-displacement Buick. It was almost as much fun as Comp Eliminator with all the different engine and weight combinations...

Good point, Larry. IHRA has always been open to trying new things. Unfortunately, they didn't always follow through. They pulled the plug on turbos in a heartbeat when Ingersoll was runner-up at a race. Neither Buddy nor Buick was pleased at how things went down and in my mind it was the main thing that drove Buick away from drag racing. Up to that point they were getting more and more interested, even assigning GM engineer Bernard Santavy as a full-time member of the crew charged with keeping the high tech engine packages in top shape.

As for variations,the year Jerry Haas won he was driving a small block Vega on nitrous. Back then there weren't any big cubic inch small blocks and when a St. Louis builder figured out how to build 450+ cubic inch engines it put him on the map for a couple of years. Sad, but I can't even remember his name now.